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教学内容:上海市九年义务教育课本数学(试用本)四年级第一学期第74页～77页。教学目标:1.借助生活中的各种工具尝试画圆,在观察、比较、归纳的过程中,逐步认识圆心(定点)、半径(定长)、直径,初步建立圆的概念并提高动手操作能力及创新意识。2.通过折一折、画一画等学习活动,在伙伴合作学习的过程中加深对圆的认识。3.体会“圆规”这一画圆工具的妙处,初步学会用圆规画圆。4.了解圆在日常生活中的应用,并通过欣赏丰富多彩的与圆有关的图形,体会几何图形的美,进一步激发对几何学习的兴趣。
Teaching content: Shanghai nine-year compulsory education textbook mathematics (trial version) fourth grade first semester 74 ~ 77 pages. Teaching Objectives: 1. With the aid of various tools in life, try to draw a circle and gradually understand the concept of circle (fixed point), radius (fixed length) and diameter during the process of observation, comparison and induction, and initially establish the concept of circle and improve hands-on operation Ability and sense of innovation. 2. Through the folding, drawing a picture and other learning activities, partners learn more in the process of deepening understanding of the circle. 3. Experience “compasses ” the beauty of this painting circle tool, initially learn to use compasses to draw a circle. 4. Learn about the application of the circle in everyday life and further appreciate the interest in geometry by appreciating the rich circle-related graphics and the beauty of geometry.